U.S. patent application number 13/731888 was filed with the patent office on 2013-05-30 for surge protection circuit.
This patent application is currently assigned to Huawei Technologies Co., Ltd.. The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Xinglin Bai, Zhanli Tang, Chengwei Wen, Xinglei Yang.
Application Number | 20130135777 13/731888 |
Document ID | / |
Family ID | 44185009 |
Filed Date | 2013-05-30 |
United States Patent
Application |
20130135777 |
Kind Code |
A1 |
Tang; Zhanli ; et
al. |
May 30, 2013 |
SURGE PROTECTION CIRCUIT
Abstract
A surge protection circuit includes a surge protection unit and
an interface electrically connected to each other. The surge
protection unit includes an internal connection terminal block,
three varistors and one discharge tube. The three varistors are
electrically connected to the internal connection terminal block,
where two varistors are electrically connected to the discharge
tube. The discharge tube is also electrically connected to the
internal connection terminal block and is grounded. The surge
protection circuit can avoid connecting a varistor to the discharge
tube in series and reduce a residual voltage of the surge
protection circuit.
Inventors: |
Tang; Zhanli; (Shanghai,
CN) ; Bai; Xinglin; (Chengdu, CN) ; Yang;
Xinglei; (Shanghai, CN) ; Wen; Chengwei;
(Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd.; |
Shenzhen |
|
CN |
|
|
Assignee: |
Huawei Technologies Co.,
Ltd.
Shenzhen
CN
|
Family ID: |
44185009 |
Appl. No.: |
13/731888 |
Filed: |
December 31, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2011/074998 |
May 31, 2011 |
|
|
|
13731888 |
|
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|
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Current U.S.
Class: |
361/56 |
Current CPC
Class: |
H02H 3/22 20130101; H02H
9/06 20130101 |
Class at
Publication: |
361/56 |
International
Class: |
H02H 3/22 20060101
H02H003/22 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 22, 2010 |
CN |
201020620604.3 |
Claims
1. A surge protection circuit, comprising: a surge protection unit
and an interface, wherein the surge protection unit is electrically
connected to the interface, the surge protection unit comprises an
internal connection terminal block, three varistors and one
discharge tube, and the three varistors are electrically connected
to the internal connection terminal block, two varistors of the
three varistors are electrically connected to the discharge tube,
and the discharge tube is electrically connected to the internal
connection terminal block and is grounded.
2. The surge protection circuit according to claim 1, wherein the
internal connection terminal block comprises a first internal
connection terminal, a second internal connection terminal, a third
internal connection terminal, a fourth internal connection
terminal, a fifth internal connection terminal, and a sixth
internal connection terminal; the three varistors are a first
varistor, a second varistor, and a third varistor; and
correspondingly, one end of the first varistor, one end of the
second varistor, and one end of the third varistor are electrically
connected to the first internal connection terminal, the second
internal connection terminal, and the fourth internal connection
terminal, respectively; the other end of the first varistor is
electrically connected to the fifth internal connection terminal,
the other end of the second varistor and the other end of the third
varistor are connected together in parallel and are electrically
connected to the sixth internal connection terminal and one end of
the discharge tube, and the other end of the discharge tube is
grounded.
3. The surge protection circuit according to claim 2, wherein the
interface is a six-row external connection terminal block, wherein
the six-row external connection terminal block comprises a first
external connection terminal, a second external connection
terminal, a third external connection terminal, a fourth external
connection terminal, a fifth external connection terminal, and a
sixth external connection terminal; and the first external
connection terminal, the second external connection terminal, the
third external connection terminal, the fourth external connection
terminal, the fifth external connection terminal, and the sixth
external connection terminal are electrically connected to the
first internal connection terminal, the second internal connection
terminal, the third internal connection terminal, the fourth
internal connection terminal, the fifth internal connection
terminal, and the sixth internal connection terminal,
respectively.
4. The surge protection circuit according to claim 1, wherein the
interface comprises a four-row external connection terminal block
and a conversion terminal block, wherein the four-row external
connection terminal block comprises a first external connection
terminal, a second external connection terminal, a third external
connection terminal, and a fourth external connection terminal, and
the conversion terminal block comprises a first conversion
terminal, a second conversion terminal, a third conversion
terminal, a fourth conversion terminal, a fifth conversion
terminal, and a sixth conversion terminal; and the first conversion
terminal and the second conversion terminal are electrically
connected to the first external connection terminal and the second
external connection terminal, respectively; the third conversion
terminal and the fourth conversion terminal are electrically
connected to the third external connection terminal, and the fifth
conversion terminal and the sixth conversion terminal are
electrically connected to the fourth external connection
terminal.
5. The surge protection circuit according to claim 4, wherein the
conversion terminal block and the internal connection terminal
block serve as a socket and a plug, respectively; or the conversion
terminal block and the internal connection terminal block serve as
a plug and a socket, respectively; and the conversion terminal
block is inserted into the internal connection terminal block, so
that the first conversion terminal, the second conversion terminal,
the third conversion terminal, the fourth conversion terminal, the
fifth conversion terminal, and the sixth conversion terminal are
electrically connected to the first internal connection terminal,
the second internal connection terminal, the third internal
connection terminal, the fourth internal connection terminal, the
fifth internal connection terminal, and the sixth internal
connection terminal comprised in the internal connection terminal
block, respectively.
6. The surge protection circuit according to claim 1, wherein the
interface comprises a three-row external connection terminal block
and a conversion terminal block, wherein the three-row external
connection terminal block comprises a first external connection
terminal, a second external connection terminal, and a third
external connection terminal, and the conversion terminal block
comprises a first conversion terminal, a second conversion
terminal, a third conversion terminal, a fourth conversion
terminal, a fifth conversion terminal, and a sixth conversion
terminal; and the first conversion terminal, the second conversion
terminal, and the third conversion terminal are electrically
connected to the first external connection terminal, the fourth
conversion terminal and the fifth conversion terminal are
electrically connected to the second external connection terminal,
and the sixth conversion terminal is electrically connected to the
third external connection terminal.
7. The surge protection circuit according to claim 6, wherein the
conversion terminal block and the internal connection terminal
block serve as a socket and a plug, respectively; or the conversion
terminal block and the internal connection terminal block serve as
a plug and a socket, respectively; and the conversion terminal
block is inserted into the internal connection terminal block, so
that the first conversion terminal, the second conversion terminal,
the third conversion terminal, the fourth conversion terminal, the
fifth conversion terminal, and the sixth conversion terminal are
electrically connected to the first internal connection terminal,
the second internal connection terminal, the third internal
connection terminal, the fourth internal connection terminal, the
fifth internal connection terminal, and the sixth internal
connection terminal comprised in the internal connection terminal
block, respectively.
8. The surge protection circuit according to claim 2, wherein the
interface comprises a four-row external connection terminal block
and a rotation terminal, wherein the four-row external connection
terminal block comprises a first external connection terminal, a
second external connection terminal, a third external connection
terminal, and a fourth external connection terminal; and the first
external connection terminal, the first internal connection
terminal, and the rotation terminal are electrically connected
together; the second external connection terminal, the third
external connection terminal, and the fourth external connection
terminal, the second internal connection terminal, the third
internal connection terminal, the fourth internal connection
terminal, the fifth internal connection terminal, and the sixth
internal connection terminal are electrically connected to the
rotation terminal.
9. The surge protection circuit according to claim 8, wherein the
rotation terminal comprises a rotation disk and a fixed disk,
wherein the rotation disk is mounted on the fixed disk and the
rotation disk rotates on the fixed disk; the fixed disk comprises a
first contact, a second contact, a third contact, a fourth contact,
a fifth contact, a sixth contact, a seventh contact, an eighth
contact, and a ninth contact, wherein the first contact, the first
external connection terminal, and the first internal connection
terminal are electrically connected together, the second contact,
the third contact, the fourth contact, the fifth contact, the sixth
contact, the seventh contact, the eighth contact, and the ninth
contact are electrically connected to the second external
connection terminal, the third external connection terminal, and
the fourth external connection terminal, the second internal
connection terminal, the third internal connection terminal, the
fourth internal connection terminal, the fifth internal connection
terminal, and the sixth internal connection terminal, respectively;
and the rotation disk comprises a first contact, a second contact,
a third contact, a fourth contact, a fifth contact, a sixth
contact, a seventh contact, an eighth contact, a ninth contact, a
tenth contact, a eleventh contact, a twelfth contact, a thirteenth
contact, a fourteenth contact, a fifteenth contact, and a sixteenth
contact, wherein the first contact is electrically connected to the
fourth contact, the second contact is electrically connected to the
fifth contact and the sixth contact, the third contact is
electrically connected to the seventh contact and the eighth
contact, the ninth contact is electrically connected to the twelfth
contact, the tenth contact is electrically connected to the
thirteenth contact and the fourteenth contact, and the eleventh
contact is electrically connected to the fifteenth contact and the
sixteenth contact.
10. The surge protection circuit according to claim 9, wherein the
rotation disk is rotated, so that the first contact, the second
contact, the third contact, the fourth contact, the fifth contact,
the sixth contact, the seventh contact, and the eighth contact in
the rotation disk are in electrical contact with and electrically
connected to the second contact, the third contact, the fourth
contact, the fifth contact, the sixth contact, the seventh contact,
the eighth contact, and the ninth contact in the fixed disk,
respectively; or the ninth contact, the tenth contact, the eleventh
contact, the twelfth contact, the thirteenth contact, the
fourteenth contact, the fifteenth contact, and the sixteenth
contact in the rotation disk are in electrical contact with and
electrically connected to the fourth contact, the second contact,
the first contact, the ninth contact, the eighth contact, the
seventh contact, the sixth contact, and the fifth contact in the
fixed disk, respectively.
11. The surge protection circuit according to claim 1, wherein the
interface comprises a four-row external connection terminal block,
wherein the four-row external connection terminal block comprises a
first external connection terminal, a second external connection
terminal, a third external connection terminal, and a fourth
external connection terminal; and the first external connection
terminal, the third external connection terminal, and the fourth
external connection terminal are electrically connected to the
first internal connection terminal, the third internal connection
terminal, and the sixth internal connection terminal in the
internal connection terminal block, respectively.
12. The surge protection circuit according to claim 1, wherein the
surge protection unit further comprises three filter inductors,
wherein the three filter inductors are electrically connected to
the internal connection terminal block.
13. A cabinet, comprising a surge protection circuit and a cabinet
body, wherein the surge protection circuit is electrically
connected to a port of the cabinet body.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2011/074998, filed on May 31, 2011, which
claims priority to Chinese Patent Application No. 201020620604.3,
filed on Nov. 22, 2010, both of which are hereby incorporated by
reference in their entireties.
TECHNICAL FIELD
[0002] The present utility model relates to the field of electronic
communications, and in particular, to a surge protection
circuit.
BACKGROUND
[0003] In the field of electronic communications, a protection
technology is required to ensure stable and reliable operation of
communication equipment. For example, a surge protection circuit
disposed at a power port or a signal port of the communication
equipment can ensure stable and reliable operation of the
communication equipment in a severe electromagnetic
environment.
[0004] Referring to FIG. 1, the prior art provides a surge
protection circuit, including a surge protection unit S1 (as shown
in a dotted box), a four-row external connection terminal block S2,
and a conversion terminal block S3. The surge protection unit S1
includes an internal connection terminal block S11, a first
varistor S12, a second varistor S13, a third varistor S14, a fourth
varistor S15, and a discharge tube S16. The internal connection
terminal block S11 includes a first internal connection terminal
L11, a second internal connection terminal L12, a third internal
connection terminal L13, and a fourth internal connection terminal
N1. One end of the first varistor S12, one end of the second
varistor S13, and one end of the third varistor S14 are
electrically connected to the first internal connection terminal
L11, the second internal connection terminal L12, and the third
internal connection terminal L13, respectively; and the other ends
of the varistors are connected in parallel together and
electrically connected to one end of the fourth varistor S15 and
the fourth internal connection terminal N1. The other end of the
fourth varistor S15 is electrically connected to one end of the
discharge tube S16, and the other end of the discharge tube S16 is
grounded. The four-row external connection terminal block S2
includes a first external connection terminal L21, a second
external connection terminal L22, a third external connection
terminal L23, and a fourth external connection terminal N2. The
conversion terminal block S3 includes a first conversion terminal
A, a second conversion terminal B, a third conversion terminal C,
and a fourth conversion terminal D. The first external connection
terminal L21, the second external connection terminal L22, the
third external connection terminal L23, and the fourth external
connection terminal N2 are electrically connected to the first
conversion terminal A, the second conversion terminal B, the third
conversion terminal C, and the fourth conversion terminal D,
respectively.
[0005] Through the surge protection circuit, a 220 V three-phase
power distribution manner, a 220 V single-phase power distribution
manner, and a 110 V dual live wire power distribution manner can be
implemented. In the 220 V three-phase power distribution manner
shown in FIG. 1, the first conversion terminal A, the second
conversion terminal B, the third conversion terminal C, and the
fourth conversion terminal D are electrically connected to the
first internal connection terminal L11, the second internal
connection terminal L12, the third internal connection terminal
L13, and the fourth internal connection terminal N1 through cables,
respectively; and then a 220 V phase wire L1, a 220 V phase wire
L2, and a 220 V phase wire L3 are electrically connected to the
first external connection terminal L21, the second external
connection terminal L22, and the third external connection terminal
L23, respectively; and a phase wire N is electrically connected to
the fourth external connection terminal N2. In the 220 V
single-phase power distribution manner shown in FIG. 2, the
internal connection terminals L11, L12 and L13 are electrically
connected to the conversion terminal A through cables, and the
fourth internal connection terminal N1 is electrically connected to
the fourth conversion terminal D through a cable. A 220 V phase
live wire L is electrically connected to the first external
connection terminal L21, and a phase wire N is electrically
connected to the fourth external connection terminal N2. In the 110
V dual live wire power distribution manner shown in FIG. 3, the
first internal connection terminal L11, the second internal
connection terminal L12, and the third internal connection terminal
L13 are electrically connected to the second conversion terminal B
through cables, and the fourth internal connection terminal N1 is
electrically connected to the third conversion terminal C. A 110 V
phase live wire L1 and a 110 V phase live wire L2 are electrically
connected to the second external connection terminal L22 and the
third external connection terminal L23, respectively.
[0006] In normal circumstances, for any one of the foregoing power
distribution manners, the voltage across the first varistor S12,
the second varistor S13, and the third varistor S14 is 220 V or 110
V. The higher the voltage across a varistor is, the smaller the
resistance value of the varistor, and the lower the voltage across
a varistor is, the larger the resistance value of the varistor is.
In this case, resistance values of the first varistor S12, the
second varistor S13, and the third varistor S14 are very large.
Currents shunted by the first varistor S12, the second varistor
S13, and the third varistor S14 from the first internal connection
terminal L11, the second internal connection terminal L12, and the
third internal connection terminal L13 are nearly zero, and most of
currents on the first internal connection terminal L11, the second
internal connection terminal L12, and the third internal connection
terminal L13 are transmitted to the communication equipment. After
the phase wire L1, L2, L3 or L externally connected to the surge
protection circuit is struck by lightning, the voltage of the first
internal connection terminal L11, the second internal connection
terminal L12 or the third internal connection terminal L13 becomes
very high, and the voltages across the first varistor S12, the
second varistor S13, and the third varistor S14 become very high
accordingly. In this case, the resistance values of the first
varistor S12, the second varistor S13 and the third varistor S14
become very small. The first varistor S12, the second varistor S13,
and the third varistor S14 shunt most of the currents on the first
internal connection terminal L11, the second internal connection
terminal L12 and the third internal connection terminal L13,
respectively, onto the discharge tube S16, and the discharge tube
S16 releases the currents to a grounded place. The currents
transmitted by the first internal connection terminal L11, the
second internal connection terminal L12 and the third internal
connection terminal L13 to the communication equipment are small.
In this way, a surge protection function is implemented.
[0007] During implementation of the present utility model, it is
found that the prior art at least has the following problems:
[0008] After lightning strike, the currents on the first varistor
S12, the second varistor S13, and the third varistor S14 are very
large, a parallel current obtained after the three varistors are
connected in parallel is greater, it is hard to find a fourth
varistor S15 capable of bearing the parallel current. In addition,
a residual voltage of the surge protection circuit includes a
voltage of the fourth varistor S15 and a voltage of the discharge
tube S16, and therefore, the residual voltage of the surge
protection circuit is high.
SUMMARY
[0009] In order to avoid connecting a varistor to a discharge tube
in series and reduce a residual voltage of a surge protection
circuit, the present utility model provides a surge protection
circuit. The technical solution is as follows:
[0010] A surge protection circuit includes:
[0011] a surge protection unit and an interface, where the surge
protection unit is electrically connected to the interface,
[0012] the surge protection unit includes an internal connection
terminal block, three varistors and one discharge tube, and
[0013] the three varistors are electrically connected to the
internal connection terminal block, two varistors of the three
varistors are electrically connected to the discharge tube, and the
discharge tube is electrically connected to the internal connection
terminal block and is grounded.
[0014] It is avoided that a varistor is connected to the discharge
tube 15 in series, and a residual voltage of the surge protection
circuit includes a voltage of the discharge tube only, thereby
reducing the residual voltage of the surge protection circuit.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 is a schematic diagram of implementation of a 220 V
three-phase power distribution manner by using a surge protection
circuit provided by the prior art;
[0016] FIG. 2 is a schematic diagram of implementation of a 220 V
single-phase power distribution manner by using a surge protection
circuit provided by the prior art;
[0017] FIG. 3 is a schematic diagram of implementation of a 110 V
dual live wire power distribution manner by using a surge
protection circuit provided by the prior art;
[0018] FIG. 4 is a schematic diagram of implementation of 220 V
three-phase power distribution by using a surge protection circuit
provided by Embodiment 1 of the present utility model;
[0019] FIG. 5 is a schematic diagram of implementation of 220 V
single-phase power distribution by using the surge protection
circuit provided by Embodiment 1 of the present utility model;
[0020] FIG. 6 is a schematic diagram of implementation of 110 V
dual live wire power distribution by using the surge protection
circuit provided by Embodiment 1 of the present utility model;
[0021] FIG. 7 is a schematic diagram of implementation of 220 V
three-phase power distribution by using a surge protection circuit
provided by Embodiment 2 of the present utility model;
[0022] FIG. 8 is a schematic diagram of implementation of 220 V
single-phase power distribution by using the surge protection
circuit provided by Embodiment 2 of the present utility model;
[0023] FIG. 9 is a schematic diagram of implementation of 110 V
dual live wire power distribution by using a surge protection
circuit provided by Embodiment 3 of the present utility model;
[0024] FIG. 10 is a schematic diagram of implementation of 220 V
single-phase power distribution by using the surge protection
circuit provided by Embodiment 3 of the present utility model;
[0025] FIG. 11 is a schematic diagram of implementation of 220 V
three-phase power distribution by using a surge protection circuit
provided by Embodiment 4 of the present utility model;
[0026] FIG. 12 is a schematic diagram of the surge protection
circuit provided by Embodiment 4 of the present utility model;
[0027] FIG. 13 is a schematic diagram of implementation of 220 V
single-phase power distribution by using the surge protection
circuit provided by Embodiment 4 of the present utility model;
[0028] FIG. 14 is a schematic diagram of implementation of 110 V
dual live wire power distribution by using the surge protection
circuit provided by Embodiment 4 of the present utility model;
[0029] FIG. 15 is a schematic diagram of implementation of 220 V
three-phase power distribution by using a surge protection circuit
provided by Embodiment 5 of the present utility model;
[0030] FIG. 16 is a schematic diagram of implementation of 220 V
single-phase power distribution by using the surge protection
circuit provided by Embodiment 5 of the present utility model;
and
[0031] FIG. 17 is a schematic diagram of implementation of 110 V
dual live wire power distribution by using the surge protection
circuit provided by Embodiment 5 of the present utility model.
DETAILED DESCRIPTION
[0032] To illustrate the objectives, technical solutions and
advantages of the present utility model more clearly, the
embodiments of the present utility model are further described in
the following with reference to the accompanying drawings.
Embodiment 1
[0033] As shown in FIG. 4, an embodiment of the present utility
model provides a surge protection circuit, including:
[0034] a surge protection unit 1 and a six-row external connection
terminal block 2, where the surge protection unit 1 includes an
internal connection terminal block 11, a first varistor 12, a
second varistor 13, a third varistor 14, and a discharge tube 15,
and the internal connection terminal block 11 includes a first
internal connection terminal L11, a second internal connection
terminal L12, a third internal connection terminal L13, a fourth
internal connection terminal L1p, a fifth internal connection
terminal N1, and a sixth internal connection terminal N11, and the
six-row external connection terminal block 2 includes a first
external connection terminal L21, a second external connection
terminal L22, a third external connection terminal L23, a fourth
external connection terminal L2p, a fifth external connection
terminal N2, and a sixth external connection terminal N21.
[0035] One end of the first varistor 12, one end of the second
varistor 13, and one end of the third varistor 14 are electrically
connected to the first internal connection terminal L11, the second
internal connection terminal L12, and the fourth internal
connection terminal L1p, respectively. The other end of the first
varistor 12 is electrically connected to the fifth internal
connection terminal N1. The other end of the second varistor 13 and
the other end of the third varistor 14 are connected together in
parallel, and are electrically connected to one end of the
discharge tube 15 and the sixth internal connection terminal N11,
and the other end of the discharge tube 15 is grounded. The first
external connection terminal L21, the second external connection
terminal L22, the third external connection terminal L23, the
fourth external connection terminal L2p, the fifth external
connection terminal N2, and the sixth external connection terminal
N21 are electrically connected to the first internal connection
terminal L11, the second internal connection terminal L12, the
third internal connection terminal L13, the fourth internal
connection terminal L1p, the fifth internal connection terminal N1,
and the sixth internal connection terminal N11, respectively.
[0036] Further, the surge protection unit 1 may also include three
filter inductors, that is, a first filter inductor 16, a second
filter inductor 17, and a third filter inductor 18, where the first
filter inductor 16, the second filter inductor 17, and the third
filter inductor 18 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13,
respectively.
[0037] Referring to FIG. 4, this embodiment provides a cabinet,
including the surge protection circuit provided by this embodiment
and a cabinet body 6, where the surge protection circuit is
electrically connected to a port of the cabinet body 6 directly.
The port of the cabinet body 6 includes a power port or a signal
port. For example, the cabinet body 6 includes a first power port
PSU1, a second power port PSU2, and a third power port PSU3, where
the first power port PSU1 is electrically connected to the first
filter inductor 16 and the fifth internal connection terminal N1 in
the surge protection unit 1, the second power port PSU2 is
electrically connected to the second filter inductor 17 and the
fifth internal connection terminal N1 in the surge protection unit
1, and the third power port PSU3 is electrically connected to the
third filter inductor 18 and the fifth internal connection terminal
N1 in the surge protection unit 1. In addition, a socket may also
be externally connected to the cabinet, where the socket is
electrically connected to the first filter inductor 16 and the
sixth internal connection terminal N11 in the surge protection unit
1. When detection equipment is used to detect the surge protection
circuit, the socket may supply power to the detection
equipment.
[0038] Through the surge protection circuit provided by this
embodiment, a 220 V three-phase power distribution manner, a 220 V
single-phase power distribution manner, and a 110 V dual live wire
power distribution manner can be implemented.
[0039] In a circuit structure of the 220 V three-phase power
distribution manner shown in FIG. 4, short connection sheets S are
used to electrically connect the fifth internal connection terminal
N1 and the sixth internal connection terminal N11 together, and
electrically connect the third internal connection terminal L13 and
the fourth internal connection terminal Lip together. The 220 V
three-phase wires L1, L2 and L3 are electrically connected to the
first external connection terminal L21, the second external
connection terminal L22, and the third external connection terminal
L23, respectively; and a phase wire N is electrically connected to
the sixth external connection terminal N21.
[0040] If the phase wires L1, L2, and L3 are struck by lightning,
voltages of the first internal connection terminal L11, the second
internal connection terminal L12, the third internal connection
terminal L13, and the fourth internal connection terminal Lip
become very high, and voltages of the first varistor 12, the second
varistor 13, and the third varistor 14 become very high
accordingly. Resistance values of the first varistor 12, the second
varistor 13, and the third varistor 14 become very small, so that
the first varistor 12, the second varistor 13, and the third
varistor 14 shunt most of currents on the first internal connection
terminal L11, the second internal connection terminal L12, and the
third internal connection terminal L13, respectively, onto the
discharge tube 15, and the discharge tube 15 releases the currents
to a grounded place. In this way, a surge protection function is
implemented.
[0041] In a circuit structure of the 220 V single-phase power
distribution manner shown in FIG. 5, short connection sheets S are
used to electrically connect the first internal connection terminal
L11, the second internal connection terminal L12, and the third
internal connection terminal L13 together, and electrically connect
the fifth internal connection terminal N1 and the sixth internal
connection terminal N11 together. A 220 V phase wire L is
electrically connected to the first external connection terminal
L21, and a phase wire N is electrically connected to the sixth
external connection terminal N21.
[0042] If the phase wire L is struck by lightning, voltages of the
first internal connection terminal L11, the second internal
connection terminal L12, and the third internal connection terminal
L13 become very high, and voltages of the first varistor 12 and the
second varistor 13 become very high accordingly. In this case,
resistance values of the first varistor 12 and the second varistor
13 become very small, so that the first varistor 12 and the second
varistor 13 shunt most of currents of the first internal connection
terminal L11, the second internal connection terminal L12, and the
third internal connection terminal L13 onto the discharge tube 15,
and the discharge tube 15 releases the currents to a grounded
place. In this way, a surge protection function is implemented.
[0043] In a circuit structure of the 110 V dual live wire power
distribution manner shown in FIG. 6, short connection sheets S are
used to electrically connect the first internal connection terminal
L11, the second internal connection terminal L12, and the third
internal connection terminal L13 together, and electrically connect
the fourth internal connection terminal Lip and the fifth internal
connection terminal N1 together. The 110 V dual live wires L1 and
L2 are electrically connected to the first external connection
terminal L21 and the fifth external connection terminal N2,
respectively; and a phase wire N is electrically connected to the
sixth external connection terminal N21.
[0044] If the phase wires L1 and L2 are struck by lightning,
voltages of the first internal connection terminal L11, the second
internal connection terminal L12, the third internal connection
terminal L13, the fourth internal connection terminal L1p, and the
fifth internal connection terminal N1 become very high, and
voltages of the second varistor 13 and the third varistor 14 become
very high. In this case, resistance values of the second varistor
13 and the third varistor 14 become very small, and the second
varistor 13 and the third varistor 14 shunt most of currents of the
first internal connection terminal L11, the second internal
connection terminal L12, the third internal connection terminal
L13, the fourth internal connection terminal L1p, and the fifth
internal connection terminal N1 onto the discharge tube 15, and the
discharge tube 15 releases the currents to a grounded place. In
this way, a surge protection function is implemented.
[0045] The discharge tube 15 cannot be directly connected to a live
wire. Referring to FIG. 4, FIG. 5, and FIG. 6, the internal
connection terminal block 11 includes a six-row internal connection
terminal, and one end of the discharge tube 15 is electrically
connected to the sixth internal connection terminal N11. During
implementation of the 220 V three-phase power distribution manner,
the 220 V single-phase power distribution manner, and the 110 V
dual live wire power distribution manner, it can be avoided that
the live wire is directly connected to the discharge tube 15, and
it is not required to connect a varistor to the discharge tube 15
in series. In addition, a residual voltage of the surge protection
circuit is a voltage of the discharge tube 15, so the residual
voltage of the surge protection circuit is lower than a residual
voltage of an existing surge protection circuit.
[0046] The six-row external connection terminal block 2 is
electrically connected to the internal connection terminal block 11
directly. During implementation of different power distribution
manners, it is only required to use the short connection sheets S
to connect a part of the internal connection terminals together,
and no space needs to be reserved between the six-row external
connection terminal block 2 and the internal connection terminal
block 11 for wiring, thereby reducing the volume of the surge
protection circuit.
[0047] In this embodiment, it is not required to connect a varistor
to the discharge tube 15 in series. In addition, the residual
voltage of the surge protection circuit includes the voltage of the
discharge tube only, thereby reducing the residual voltage of the
surge protection circuit.
Embodiment 2
[0048] An embodiment of the present utility model provides a surge
protection circuit, where the surge protection circuit can
implement a 220 V three-phase power distribution manner and a 220 V
single-phase power distribution manner. Referring to FIG. 7, the
surge protection circuit includes a surge protection unit 1, a
four-row external connection terminal block S2, and a conversion
terminal block 3.
[0049] The surge protection unit 1 includes an internal connection
terminal block 11, a first varistor 12, a second varistor 13, a
third varistor 14, and a discharge tube 15, where the internal
connection terminal block 11 includes a first internal connection
terminal L11, a second internal connection terminal L12, a third
internal connection terminal L13, a fourth internal connection
terminal L1p, a fifth internal connection terminal N1, and a sixth
internal connection terminal N11. One end of the first varistor 12,
one end of the second varistor 13, and one end of the third
varistor 14 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the fourth internal connection terminal L1p, respectively.
The other end of the first varistor 12 is electrically connected to
the fifth internal connection terminal N1. The other end of the
second varistor 13 and the other end of the third varistor 14 are
connected together in parallel, and are electrically connected to
the sixth internal connection terminal N11 and one end of the
discharge tube 15, and the other end of the discharge tube 15 is
grounded.
[0050] The four-row external connection terminal block S2 includes
a first external connection terminal L21, a second external
connection terminal L22, a third external connection terminal L23,
and a fourth external connection terminal N2. The conversion
terminal block 3 includes a first conversion terminal L31, a second
conversion terminal L32, a third conversion terminal L33, a fourth
conversion terminal L3p, a fifth conversion terminal N3, and a
sixth conversion terminal N31. The first conversion terminal L31
and the second conversion terminal L32 are electrically connected
to the first external connection terminal L21 and the second
external connection terminal L22, respectively. The third
conversion terminal L33 and the fourth conversion terminal L3p are
electrically connected to the third external connection terminal
L23. The fifth conversion terminal N3 and the sixth conversion
terminal N31 are electrically connected to the fourth external
connection terminal N2.
[0051] The conversion terminal block 3 and the internal connection
terminal block 11 serve as a socket and a plug, respectively; or
the conversion terminal block 3 and the internal connection
terminal block 11 serve as a plug and a socket, respectively.
Correspondingly, by inserting the conversion terminal block 3 into
the internal connection terminal block 11, the first conversion
terminal L31, the second conversion terminal L32, the third
conversion terminal L33, the fourth conversion terminal L3p, the
fifth conversion terminal N3, and the sixth conversion terminal N31
in the conversion terminal block 3 are electrically connected to
the first internal connection terminal L11, the second internal
connection terminal L12, the third internal connection terminal
L13, the fourth internal connection terminal L1p, the fifth
internal connection terminal N1, and the sixth internal connection
terminal N11 in the internal connection terminal block 11,
respectively.
[0052] The four-row external connection terminal block S2 and the
conversion terminal block 3 may be integrated onto a circuit board,
and the conversion terminal block 3 may be directly inserted into
the internal connection terminal block 11, and may also be directly
pulled out from the internal connection terminal block 11.
[0053] Further, the surge protection unit 1 may also include three
filter inductors, that is, a first filter inductor 16, a second
filter inductor 17, and a third filter inductor 18, where the first
filter inductor 16, the second filter inductor 17, and the third
filter inductor 18 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13,
respectively.
[0054] Through the surge protection circuit provided by this
embodiment, a 220 V three-phase power distribution manner and a 220
V single-phase power distribution manner can be implemented.
[0055] Referring to FIG. 7, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V three-phase power distribution manner, that is, the 220 V
three-phase wires L1, L2, and L3 are electrically connected to the
first external connection terminal L21, the second external
connection terminal L22, and the third external connection terminal
L23, respectively; and a phase wire N is electrically connected to
the fourth external connection terminal N2.
[0056] In the circuit structure of the 220 V three-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0057] Referring to FIG. 8, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V single-phase power distribution manner, that is, a short
connection sheet S is used to electrically connect the first
external connection terminal L21, the second external connection
terminal L22, and the third external connection terminal L23
together, and a 220 V phase wire L is electrically connected to the
first external connection terminal L21, and a phase wire N is
electrically connected to the fourth external connection terminal
N2.
[0058] In the circuit structure of the 220 V single-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0059] Referring to FIG. 7 and FIG. 8, the internal connection
terminal block 11 includes a six-row internal connection terminal,
and one end of the discharge tube 15 is electrically connected to
the sixth internal connection terminal N11. During implementation
of the 220 V three-phase power distribution manner and the 220 V
single-phase power distribution manner, it can be avoided that the
live wire is directly connected to the discharge tube 15, and it is
not required to connect a varistor to the discharge tube 15 in
series. In addition, a residual voltage of the surge protection
circuit is a voltage of the discharge tube 15, so the residual
voltage of the surge protection circuit is lower than a residual
voltage of an existing surge protection circuit.
[0060] The conversion terminal block 3 is electrically connected to
the internal connection terminal block 11 directly in an insertion
manner. During implementation of different power distribution
manners, it is only required to use the short connection sheet S to
connect a part of the external connection terminals together, and
no space needs to be reserved between the conversion terminal block
3 and the internal connection terminal block 11 for wiring, thereby
reducing the volume of the surge protection circuit.
[0061] Referring to FIG. 7, this embodiment provides a cabinet. The
cabinet includes the surge protection circuit provided by this
embodiment and a cabinet body 6. The surge protection circuit is
electrically connected to a port of the cabinet body 6. A socket
may also be externally connected to the cabinet, and the socket is
electrically connected to the surge protection circuit. The port of
the cabinet body 6 includes a power port or a signal port. A
specific connection relationship among the surge protection
circuit, the power port or the signal port of the cabinet body 6
and the socket is the same as corresponding content in Embodiment
1, which is not described again herein.
[0062] In this embodiment, it is not required to connect a varistor
to the discharge tube 15 in series. In addition, the residual
voltage of the surge protection circuit includes the voltage of the
discharge tube only, thereby reducing the residual voltage.
Embodiment 3
[0063] An embodiment of the present utility model provides a surge
protection circuit, where the surge protection circuit can
implement a 110 V dual live wire power distribution manner and a
220 V single-phase power distribution manner. Referring to FIG. 9,
the surge protection circuit includes a surge protection unit 1, a
three-row external connection terminal block 4, and a conversion
terminal block 3.
[0064] A structure of the surge protection unit 1 is the same as
the structure of the surge protection unit 1 provided by Embodiment
2, which is not described again herein.
[0065] The three-row external connection terminal block 4 includes
a first external connection terminal L21, a second external
connection terminal L22, and a third external connection terminal
N2. The conversion terminal block 3 includes a first conversion
terminal L31, a second conversion terminal L32, a third conversion
terminal L33, a fourth conversion terminal L3p, a fifth conversion
terminal N3, and a sixth conversion terminal N31. The first
conversion terminal L31, the second conversion terminal L32, and
the third conversion terminal L33 are electrically connected to the
first external connection terminal L21. The fourth conversion
terminal L3p and the fifth conversion terminal N3 are electrically
connected to the second external connection terminal L22. The sixth
conversion terminal N31 is electrically connected to the third
external connection terminal N2.
[0066] The conversion terminal block 3 and the internal connection
terminal block 11 serve as a socket and a plug, respectively; or
the conversion terminal block 3 and the internal connection
terminal block 11 serve as a plug and a socket, respectively.
Correspondingly, by inserting the conversion terminal block 3 into
the internal connection terminal block 11, the first conversion
terminal L31, the second conversion terminal L32, the third
conversion terminal L33, the fourth conversion terminal L3p, the
fifth conversion terminal N3, and the sixth conversion terminal N31
in the conversion terminal block 3 are electrically connected to
the first internal connection terminal L11, the second internal
connection terminal L12, the third internal connection terminal
L13, the fourth internal connection terminal L1p, the fifth
internal connection terminal N1, and the sixth internal connection
terminal N11 in the internal connection terminal block 11,
respectively.
[0067] The three-row external connection terminal block 4 and the
conversion terminal block 3 may be integrated onto a circuit board,
and the conversion terminal block 3 may be directly inserted into
the internal connection terminal block 11, and may also be directly
pulled out from the internal connection terminal block 11.
[0068] Further, the surge protection unit 1 may also include three
filter inductors, that is, a first filter inductor 16, a second
filter inductor 17, and a third filter inductor 18, where the first
filter inductor 16, the second filter inductor 17, and the third
filter inductor 18 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13,
respectively.
[0069] Through the surge protection circuit provided by this
embodiment, a 110 V dual live wire power distribution manner and a
220 V single-phase power distribution manner can be
implemented.
[0070] Referring to FIG. 9, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
110 V dual live wire power distribution manner, that is, 110 V dual
live wires L1 and L2 are electrically connected to the first
external connection terminal L21 and the second external connection
terminal L22, respectively; and a phase wire N is electrically
connected to the third external connection terminal N2.
[0071] In the circuit structure of the 110 V dual live wire power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0072] Referring to FIG. 10, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V single-phase power distribution manner, that is, a short
connection sheet S is used to electrically connect the second
external connection terminal L22 and the third external connection
terminal N2 together. A 220 V phase wire L is electrically
connected to the first external connection terminal L21, and a
phase wire N is electrically connected to the third external
connection terminal N2.
[0073] In the circuit structure of the 220 V single-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0074] Referring to FIG. 9 and FIG. 10, the internal connection
terminal block 11 includes a six-row internal connection terminal,
and one end of the discharge tube 15 is electrically connected to
the sixth internal connection terminal N11. During implementation
of 110 V dual live wire power distribution manner and the 220 V
single-phase power distribution manner, it can be avoided that the
live wire is directly connected to the discharge tube 15, and it is
not required to connect a varistor to the discharge tube 15 in
series. In addition, a residual voltage of the surge protection
circuit is a voltage of the discharge tube 15, so the residual
voltage of the surge protection circuit is lower than a residual
voltage of an existing surge protection circuit.
[0075] The conversion terminal block 3 is electrically connected to
the internal connection terminal block 11 in an insertion manner.
During implementation of different power distribution manners, it
is only required to use the short connection sheet S to connect a
part of the external connection terminals together, and no space
needs to be reserved between the conversion terminal block 3 and
the internal connection terminal block 11 for wiring, thereby
reducing the volume of the surge protection circuit.
[0076] Referring to FIG. 9, this embodiment provides a cabinet,
including the surge protection circuit provided by this embodiment
and a cabinet body 6. The surge protection circuit is electrically
connected to a port of the cabinet body 6. A socket may also be
externally connected to the cabinet, and the socket is electrically
connected to the surge protection circuit. The port of the cabinet
body 6 includes a power port or a signal port. A specific
connection relationship among the surge protection circuit, the
power port or the signal port of the cabinet body 6 and the socket
is the same as corresponding content in Embodiment 1, which is not
described again herein.
[0077] In this embodiment, it is not required to connect a varistor
to the discharge tube 15 in series. In addition, the residual
voltage of the surge protection circuit includes the voltage of the
discharge tube only, thereby reducing the residual voltage of the
surge protection circuit.
Embodiment 4
[0078] As shown in FIG. 11, an embodiment of the present utility
model provides a surge protection circuit, including a surge
protection unit 1, a four-row external connection terminal block
S2, and a rotation terminal 5.
[0079] A structure of the surge protection unit 1 is the same as
the structure of the surge protection unit 1 provided by Embodiment
1, which is not described again herein.
[0080] The four-row external connection terminal block S2 includes
a first external connection terminal L21, a second external
connection terminal L22, a third external connection terminal L23,
and a fourth external connection terminal N2.
[0081] Referring to FIG. 12, the rotation terminal 5 includes a
rotation disk 51 and a fixed disk 52. The rotation disk 51 includes
a first contact a, a second contact b, a third contact c, a fourth
contact d, a fifth contact e, a sixth contact f, a seventh contact
g, an eighth contact h, a ninth contact 1, a tenth contact 2, an
eleventh contact 3, a twelfth contact 4, a thirteenth contact 5, a
fourteenth contact 6, a fifteenth contact 7, and a sixteenth
contact 8. The first contact a is electrically connected to the
fourth contact d. The second contact b, the fifth contact e, and
the sixth contact f are electrically connected together. The third
contact c, the seventh contact g, and the eighth contact h are
electrically connected together. The ninth contact 1 is
electrically connected to the twelfth contact 4. The tenth contact
2, the thirteenth contact 5, and the fourteenth contact 6 are
electrically connected together. The eleventh contact 3, the
fifteenth contact 7, and the sixteenth contact 8 are electrically
connected together. The fixed disk 52 includes a first contact A, a
second contact B, a third contact C, a fourth contact D, a fifth
contact E, a sixth contact F, a seventh contact G, an eighth
contact H, and a ninth contact J.
[0082] The first internal connection terminal L11, the first
external connection terminal L21, and the first contact A of the
fixed disk 52 are electrically connected together. The second
internal connection terminal L12, the third internal connection
terminal L13, the fourth internal connection terminal Lip, the
fifth internal connection terminal N1, and the sixth internal
connection terminal N11 are electrically connected to the fifth
contact E, the sixth contact F, the seventh contact G, the eighth
contact H, and the ninth contact J in the fixed disk 52,
respectively. The second external connection terminal L22, the
third external connection terminal L23, and the fourth external
connection terminal N2 are electrically connected to the second
contact B, the third contact C, and the fourth contact D,
respectively. The rotation disk 51 is mounted on the fixed disk 52
and can be rotated on the fixed disk 52.
[0083] Further, the surge protection unit 1 may also include three
filter inductors, that is, a first filter inductor 16, a second
filter inductor 17, and a third filter inductor 18, where the first
filter inductor 16, the second filter inductor 17, and the third
filter inductor 18 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13,
respectively.
[0084] Through the surge protection circuit provided by this
embodiment, a 220 V three-phase power distribution manner, a 220 V
single-phase power distribution manner, and a 110 V dual live wire
power distribution manner can be implemented.
[0085] As shown in FIG. 11, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V three-phase power distribution manner, that is, the rotation
disk 51 is rotated so that the first contact a, the second contact
b, the third contact c, the fourth contact d, the fifth contact e,
the sixth contact f, the seventh contact g, and the eighth contact
h are in electrical contact with the second contact B, the third
contact C, the fourth contact D, the fifth contact E, the sixth
contact F, the seventh contact G, the eighth contact H, and the
ninth contact J on the fixed disk 52, respectively. The 220 V
three-phase wires L1, L2, and L3 are electrically connected to the
first external connection terminal L21, the second external
connection terminal L22, and the third external connection terminal
L23, respectively. A phase wire N is electrically connected to the
fourth external connection terminal N2.
[0086] In the circuit structure of the 220 V three-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0087] As shown in FIG. 13, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V single-phase power distribution manner, that is, the rotation
disk 51 is rotated so that the first contact a, the second contact
b, the third contact c, the fourth contact d, the fifth contact e,
the sixth contact f, the seventh contact g, and the eighth contact
h are in electrical contact with the second contact B, the third
contact C, the fourth contact D, the fifth contact E, the sixth
contact F, the seventh contact G, the eighth contact H, and the
ninth contact J on the fixed disk 52. Short connection sheets S are
used to electrically connect the external connection terminals L21,
L22, and L23 together. A 220 V phase wire L is electrically
connected to the first external connection terminal L21. A phase
wire N is electrically connected to the fourth external connection
terminal N2.
[0088] In the circuit structure of the 220 V single-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0089] As shown in FIG. 14, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
110 V dual live wire power distribution manner, that is, the
rotation disk 51 is rotated so that the ninth contact 1, the tenth
contact 2, the eleventh contact 3, the twelfth contact 4, the
thirteenth contact 5, the fourteenth contact 6, the fifteenth
contact 7, and the sixteenth contact 8 are in electrical contact
with the fourth contact D, the second contact B, the first contact
A, the ninth contact J, the eighth contact H, the seventh contact
G, the sixth contact F, and the fifth contact E on the fixed disk
52, respectively. The 110 V dual live wires L1 and L2 are
electrically connected to the first external connection terminal
L21 and the second external connection terminal L22, respectively.
A phase wire N is electrically connected to the fourth external
connection terminal N2.
[0090] In the circuit structure of the 110 V dual live wire power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0091] Referring to FIG. 14, the internal connection terminal block
11 includes a six-row internal connection terminal, and one end of
the discharge tube 15 is electrically connected to the sixth
internal connection terminal N11. During implementation of the 220
V three-phase power distribution manner, the 220 V single-phase
power distribution manner, and the 110 V dual live wire power
distribution manner, it can be avoided that the live wire is
directly connected to the discharge tube 15, and it is not required
to connect a varistor to the discharge tube 15 in series. In
addition, a residual voltage of the surge protection circuit is a
voltage of the discharge tube 15, so the residual voltage of the
surge protection circuit is lower than a residual voltage of an
existing surge protection circuit.
[0092] The four-row external connection terminal block S2 and the
rotation terminal 5 are electrically connected to the internal
connection terminal block 11 directly. During implementation of
different power distribution manners, it is only required to use
the short connection sheet S to connect a part of the external
connection terminals together, and no space needs to be reserved in
the surge protection circuit for wiring, thereby reducing the
volume of the surge protection circuit.
[0093] Referring to FIG. 11, this embodiment provides a cabinet,
including the surge protection circuit provided by this embodiment
and a cabinet body 6. The surge protection circuit is electrically
connected to a port of the cabinet body 6. A socket may also be
externally connected to the cabinet, and the socket is electrically
connected to the surge protection circuit. The port of the cabinet
body 6 includes a power port or a signal port. A specific
connection relationship among the surge protection circuit, the
power port or the signal port of the cabinet body 6 and the socket
is the same as corresponding content in Embodiment 1, which is not
described again herein.
[0094] In this embodiment, it is not required to connect a varistor
to the discharge tube 15 in series. In addition, the residual
voltage of the surge protection circuit includes the voltage of the
discharge tube only, thereby reducing the residual voltage. In
addition, different power distribution manners can be implemented
by rotating the rotation disk, thereby being convenient for the
user and improving user experience.
Embodiment 5
[0095] As shown in FIG. 15, an embodiment of the present utility
model provides a surge protection circuit, including a surge
protection unit 1 and a four-row external connection terminal block
S2.
[0096] A structure of the surge protection unit 1 is the same as
the structure of the surge protection unit 1 provided by Embodiment
1, which is not described again herein.
[0097] A structure of the four-row external connection terminal
block S2 is the same as the structure of four-row external
connection terminal block S2 provided by Embodiment 4, which is not
described again herein.
[0098] A first external connection terminal L21, a third external
connection terminal L23, and a fourth external connection terminal
N2 are electrically connected to a first internal connection
terminal L11, a third internal connection terminal L13, and a sixth
internal connection terminal N11, respectively.
[0099] Further, the surge protection unit 1 may also include three
filter inductors, that is, a first filter inductor 16, a second
filter inductor 17, and a third filter inductor 18, where the first
filter inductor 16, the second filter inductor 17, and the third
filter inductor 18 are electrically connected to the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13,
respectively.
[0100] Through the surge protection circuit provided by this
embodiment, a 220 V three-phase power distribution manner, a 220 V
single-phase power distribution manner, and a 110 V dual live wire
power distribution manner can be implemented.
[0101] As shown in FIG. 15, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V three-phase power distribution manner, that is, short
connection sheets S are used to connect the third internal
connection terminal L13 and the fourth L1p together and connect the
fifth internal connection terminal N1 and the sixth internal
connection terminal N11 together. Cables are used to electrically
connect the second external connection terminal L22 to the second
internal connection terminal L12, electrically connect 220 V
three-phase wires L1, L2, and L3 to the first external connection
terminal L21, the second external connection terminal L22, and the
third external connection terminal L23, respectively; and
electrically connect a phase wire N to the fourth external
connection terminal N2.
[0102] In the circuit structure of the 220 V three-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0103] As shown in FIG. 16, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
220 V single-phase power distribution manner, that is, short
connection sheets S are used to connect the first internal
connection terminal L11, the second internal connection terminal
L12, and the third internal connection terminal L13 together and
connect the fifth internal connection terminal N1 and the sixth
internal connection terminal N11 together. Cables are used to
electrically connect the second external connection terminal L22 to
the second internal connection terminal L12, electrically connect a
220 V phase wire L to the first external connection terminal L21,
and electrically connect a phase wire N to the fourth external
connection terminal N2.
[0104] In the circuit structure of the 220 V single-phase power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0105] As shown in FIG. 17, the surge protection circuit provided
by this embodiment is used to implement a circuit structure of the
110 V dual live wire power distribution manner, that is, short
connection sheets S are used to connect the fifth internal
connection terminal N1 and the fourth internal connection terminal
L1p together and connect the first internal connection terminal
L11, the second internal connection terminal L12, and the third
internal connection terminal L13 together. Cables are used to
electrically connect the second external connection terminal L22 to
the fifth internal connection terminal N1, electrically connect 110
V dual live wires L1 and L2 to the first external connection
terminal L21 and the second external connection terminal L22,
respectively; and electrically connect a phase wire N to the fourth
external connection terminal N2.
[0106] In the circuit structure of the 110 V dual live wire power
distribution manner, the surge protection circuit can implement a
surge protection function, and the specific implementation process
is the same as a part of the content of Embodiment 1, which is not
described again herein.
[0107] Referring to FIG. 17, the internal connection terminal block
11 includes a six-row internal connection terminal, and one end of
the discharge tube 15 is electrically connected to the sixth
internal connection terminal N11. During implementation of the 220
V three-phase power distribution manner, the 220 V single-phase
power distribution manner, and the 110 V dual live wire power
distribution manner, it can be avoided that the live wire is
directly connected to the discharge tube 15, and it is not required
to connect a varistor to the discharge tube 15 in series. In
addition, a residual voltage of the surge protection circuit is a
voltage of the discharge tube 15, so the residual voltage of the
surge protection circuit is lower than a residual voltage of an
existing surge protection circuit.
[0108] Referring to FIG. 15, this embodiment provides a cabinet,
including the surge protection circuit provided by this embodiment
and a cabinet body 6. The surge protection circuit is electrically
connected to a port of the cabinet body 6. A socket may also be
externally connected to the cabinet, and the socket is electrically
connected to the surge protection circuit. The port of the cabinet
body 6 includes a power port or a signal port. A specific
connection relationship among the surge protection circuit, the
power port or the signal port of the cabinet body 6 and the socket
is the same as corresponding content in Embodiment 1, which is not
described again herein.
[0109] In this embodiment, it is not required to connect a varistor
to the discharge tube 15 in series. In addition, the residual
voltage of the surge protection circuit includes the voltage of the
discharge tube only, thereby reducing the residual voltage of the
surge protection circuit.
[0110] The above descriptions are merely exemplary embodiments of
the present utility model, and are not intended to limit the
present utility model. Any modifications, equivalent substitutions
and improvements made within the spirit and principle of the
present utility model should be included within the scope of
protection of the present utility model.
* * * * *